Supporting and driving construction for gyratory grinding mills



Feb. 8, 192 7, 1,616,844

J. G. BURKE v SUPPORTINGAND'DRIVING CONSTRUCTION FOR GYRATORY GRINDING MILLS v 2 Sheets-Sheet 1 *Flg. 1.

v I inve ni'or. James G. BurKe I I byM k reb. 8, 1927. J. G. BURKE SUPPORTING AND'DRIVING CONSTRUCTION'FO'R GYRATORY GRINDING MILLS Filed Oct. 24, 1924 Y m n e v i A. 3 mm m 7 6 v 3 .l 8 7 3 2 I 2 S S 8 5 3 2 A 4. 0 4 5 .........r.....4 m m 0 Y dom es G. BurKe byiamwaw Anya.

' Patented Feb. ,1927.

JAMES G. BURKE, F AnLENrowmrnNnsYLvAnrA, nssieivon T0 BRADLEY run VERIZER COMPANY; oFALLEu'rowN, rnNnsYLvnN m A' oonronnrron or MAINE.

SUPPORTING AND nnrvliveoonsrnuorlon roe e RA'roIiY eiexiinrive Mi'LLsJ Application filedOct'ober 24. 1924; 'SeriaLNo. 745,553.

This invention relates to improvements in grinding mills of the type which comprises a grinding chamber having an annular die therein and a co-operating grinding roll the shaft of which is supported by a universal coupling upona driving member in such a manner that the roll when rotated is given a 'gyratory movement annular die. 7 I I This general type of'mill is disclosed in and exemplified by Patents Nos. 1,095,986, granted May 5, 1914; 1,262,379., granted April. 9, 1918; and 1,466,433 granted August 28, 1923, and the patents therein cited. In allof these constructions the universal coupling member which supports'the shaft of the roll comprises upper and lower complee mentary casing members which are secured together and are provided with diametrically oppositely opposed ways which receive and guide segments pivotally mounted upon trunnions' extending diametrically in oppo-r site directions from a cross head which .either supports the roll shaft or whichsup ports the coupling casing and the roll shaft. In such constructions numerous'wear plates are re uired which have to bevery accurately mac ined. Furthermore, in each of these constructions bearing members having complementaryspherical surfaces are provided to permit rocking movement of the cross head and these members must be of hardened materialand present accurately machined cooperating surfaces.

The principal object of the present invention is to provide a mill of this type with a universal coupling of simplified construction having a minimum number. of parts and in which the necessity forcarefully machined wearing surfaces isavoi'ded.

' A further object of the invention is to provide a universal coupling of this character withnovel means for insuring the proper supply of oil to the trunnion'bearing's.

Another object of the invention is to provide a universal coupling of this character with a simplified means for securing a pulleyor other driving element thereto."

to co-operate with the A further object of-th'e invention is to provide a constructionin which the bossesfor the internal bearings of the coupling can be readily-machined. 5

Other objects and'f'eatures of the" invention will'more fully appeanfrom-the following description 'and theaccompanying drawings 'and'willb'e pointed out in the claims.

' In the drawings: i .c 'F'g. 1 is a vertical longitudinal sectional view through a grinding mill 0f the type above described embodying the present invention; I I Fig. 2 is an enlarged detail view in vertical section of the driving member in a plane at right angles to thesection illustrated in Fig.1;and, Y

r Fig." 3 isa plan view of the lower section of the driving member, the upper section being removed. v I The grinding mill illustrated in the accom panying drawings is'fof the usual Grifiin type comprising a' base or body 1 having a pan 2 furnished with an annular-die 3 above which is loc'ated'an annular screen 4 and a surroundingiannular casing 5. The roll supporting frame comprises a series of upwardly converging posts -or* legs 6 which are fixedly secured at their lower ends to the v base 1 and at their upper ends" support a girder 7'whichis centrally provided with a spherical socket 8 which receives a comple vertical bore provided with a bushing 10 for a supportingshaft 11. The-bearing box 9 presents a cylindrical upwardly extending chamber12 which constitutes the lubricai'it receptacle and the lower wall of the chain'- ber'desirably is'spherical and forms a seat for a plate 13 having a'complem'enta'ry spher- -mentary sphericalbearing box 9 having a ical lower surface and a flatup per surface upon which is mounted' a'ball bearing 14. An annular collar 15 engages the upper race of the ball bearing and is provided with a tapered central aperture which receives a nut 16 upon the screw threaded end of'the shaft 9. The driving member and'roll'shaft are The roll shaft supporting and driving con struction which contains the umversal coupling forthe roll shaft may be of any suiting an outer cylindrical wall 22 and airupwardly converging conical inner wall 23, the outer wall 22 being rotatably mounted in a bushing 24 in a bearing 25 carried by a suitable cross girder 26 of the. frame. The up per section 27 of the supporting and driving construction I desirably is of conoidal form and is provided at its lower end with an outwardly extending flange 28 which is j bolted to the flange 18 of the lower section. The conoidal member 27 is provided with an upwardly extending boss 29 having an up- .wardly converging aperture therethrough which receives and fits the lower conoidal end 30 of the supporting shaft 11.

Preferably the boss 29 has an upwardly extending annular flange 31 which surrounds the lower end of the. spherical section 9 of the bearing box to receive such lubricant as may pass through the upper bearing and a duct 32 in said boss serves to conduct the oil from the chamber thus formed into the hollow hub of the supporting anddriving construction, A duct. 33, leading axially through the shaft 11, also provides means for supplying oil to the chamber of the hub.

The shaft of the gyrating roll is supported by a universal coupling located within the hub ofthe su ortin and drivin member.

The principal object of the present invention, as heretofore stated, is to provide a simpler and more economical and eflicient universal coupling having fewer parts and particularly omitting the numerous parts which have to be carefully machined and accurately assembled. In the preferred embodiment of the invention disclosed herein the body member 17 of the supporting and driving construction is provided with a pair of diametrically oppositely disposed apertured or recessed internal. bosses 34 to provide trunnion bearings for the .universal coupling which preferably are spaced at short distance from the inner wall of the driving and supporting member to provide oil pockets 35 at the ends of the trunnion bearings. v

In theparticular construction illustrated the wall of the body section of the supporting and driving member is somewhat bulged outwardly to permit the use of relatively wide bosses. The apertures in the bosses The hollow hub 17 desirably is; provided with a downwardextension 21 havare of semi-cylindrical form and bearing ing in the direction of the minor axis of the ellipse and seated in the trunnion bearings in the bosses 34. The cross head saddle is provided with diametrically. oppo'sitesemicylindrical bearing recesses 40 extending in the direction of the major axis of the ellipse and the bearing is completed-bycaps 41. secured to the cross head. saddle and pro vid-ed with complementary semi-cylindrical recesses. The bearing thus formed is providedwith suitable bushings 42. The roll shaft supporting cross head 43 is provided with diametricallyoppositely extending trunnions 44 which are mounted in the bear ings in the cross head saddle. The cross head 43 desirably is formed with an upper conical extension having an upwardly cone verging conical socket to receive the conical end 45 of the. roll shaft 46 and the roll 47 is mounted upon the'tapered lower end o'f the roll shaft and secured thereto by a nut 48 upon the screw threaded lower endwof the roll shaft; The nut desirably is provided with'a series of recessesto receive a locking pin 49 which is seated in the roll and which acts to prevent the nut from unscrewing. The under face of the cross head 43 jdesirably is provided with a conoidal recess- 50 which extends well into the cross head. A conical sleeve 51 is secured to the lower por tion of the'inner wall of the supporting and driving member by an oil-tight joint 52 and extends upwardly well into the recess in the cross head. This sleeve desirably is of 'such co'nicity as to. form an extei'ision. of the inner suitable gearing as is well understood'and the entire driving and supporting constructionrotated upon the suspending shaft 11. The roll shaftis swung so that the roll will engage the annular die at the time the mill is started and from that time on centrifugal force will. cause the roll to co-operate with the annular die, the universal coupling within the supporting and drivingemember permitting the roll thus to co-operate at all tlmes. As the cross head saddle swings upon its trunnion bearings the trunnions of the ber 58. trunnions of the cross head saddle are wares cross head will-dip into the oil in the oil chamber 53'and vthus maintain the'bearings of the cross head at-all times in a good state of lubrication. The centrifugal force will also cause theoil tobetthrown outwardly into the pockets 35 atthe ends ofthetrun nion bearings'up'onfwhich the cross head saddle is mounted and these pockets will retard the return of the oil to the oil cham- Thus the bearings in which the mounted will likewise be maintainedin a proper state of lubrication at all times.

In order to provide for the boring or machining of the bearings in the bosses, and

also to insure proper alinement of these bearings, the wall of the supporting and driving construction is provided with a recess 54 through which suitable tools may be entered to bore and finish the bearings.

Thus the device may be placed in a ig and the bearings for the cross head trunnions bored in absolutely accurate alinement and properly finished. In accomplishing this purpose thecaps for the bearings may be,

I bolted to the bosses before the bearing recesses are bored. The aperture 5% is' closed by a suitable'plug 55 such as a screw threaded plug having threads engaging compleand driving member with its universal cou pling is constructed of a minimum number of parts which can be readily and accurately made and quickly assembled and in which no specially machined parts are required.

It will be understood that the embodiment of the invention disclosed herein is of an illustrative character and is notrestrictive and that various changes in form, construction and arrangement of parts may be made within the spirit and 'scopeof the following claims.

Having thus described the invention, What is claimed as new, and desired to be secured by Letters Patent, is:

1. In a grinding mill of the class described comprising a frame, a rotatable driving member carried by said frame having a hollow hub provided with diametrically opposite bearings forming part of the hub structure and wholly enclosed therein, a

cross head saddle within said hub having scribed comprising .a frame, (a depending supporting shaft rotatably mounted therein, a rotatable driving-'member carried by said supporting. shaft having a hollow hub; and

provided "withga downward extension ourmilled in said frame, across head saddle within said hub having trunnions mounted incylindrical bearings wholly enclosed within said hub and integral therewith, a cross head having trunnions mounted in bearings in said cross head saddle at right angles to said saddle trunnions and a roll shaft suspended from said cross head.

3. In a grinding mill of the class dc scribed comprising .a frame, a rotatable 'driving'member carried by sa1d frame having a hollow hub,a cross head saddle within said hub having trunnions mounted in cylindrical bearings wholly enclosed within said hub and integral therewith, a cross head having trunnions mounted in bearings in said cross head saddle atright angles to said saddle trunnions and provided witha' cen-' tral recess, a sleeve extending from the lower portion of said hub into saidrecess to provide an oil chamber within said hub, and oil pockets at the ends of said saddle trunnions to receive oil thrown outwardly by centrifugal forceand acting to retardthe return of the oil to thefoil chamber and a roll shaft suspended from said cross head.

l. In a machine of the class described, a

roll shaft supporting construction comprising a body section having a hollow hub provided with internal alined cylindrical bearings wholly enclosed within said body section, a centrally aperturedcross head saddle having trunnions mounted in said bearings and a shaft supporting cross head within the aperture in said saddle having trunnions mounted in bearings in said saddle at right 1 angles to said saddle trunnions and a cap section secured to said body section.

5. In a machine of the class described, a

roll shaft supporting construction compris ing a body section having a hollow hub of generally hemi-spheroidal form, a. pair of diametrically oppositely disposedapertured peripheral wall thereof providing trunnion bearings with anoil-receivingrecess at the end of each bearing, an aperture in the hub wall inalinement with the apertures in said bosses to permit, the insertion of means for boring said bosses to provide bearings, means for sealing said aperture, a cross head saddle having trunnions mounted in said bearings and a shaft supporting cross head having trunnions mounted in bearings in said saddle at right angles to said saddle trunnions. e 6. In a machine of the class described, a roll. shaft supporting construction comprising a body section having a hollow hub of generally hemi-spheroidal form, a pair of diametrically oppositely disposed apertured bosses Within said hub providing trunnion located in the line of the major axis of the bearings and spaced apart from the 'periphellipse and a roll shaft supporting cross eral Wall thereof, a hollow elliptical cross head having trunnions journalled in, the 10 head saddle having trunnions extending out hearings in said saddle.

-, 5 Wardly therefor-min the line of the minor In testimony whereof, I have signed my axis of the ellipse and journalled in said name to this specification. V bearings, trunnion hearings in said saddle JAMES G. BURKE. 

